Fuel filling method and apparatus for cryogenic foam target for laser fusion

摘要

PURPOSE:To control a filling amount of a fuel precisely and to fill the fuel solely to a foam structure by heating a hollow foam sphere which is completely soaked into a liquid fuel containing a deuterium, by taking out the hollow foam sphere out of the liquid fuel after confirming spouting of a gasified liquid fuel from the hollow foam sphere. CONSTITUTION:After a hollow foam sphere 3 is set to a device, the whole device is vacuumized and is cooled down to 20K. Thereafter, a deuterium gas is supplied to a quartz glass test tube 11 at a pressure of 600Torrs through a gas induction guide 5 of an upper cryostat 1. The deuterium gas is liquefied and settled at a bottom of the quarts glass test tube 11. Then the hollow foam sphere 3 is soaked into a liquid deuterium and within one minute after, is heated by a heater 12. When a deuterium gas sprouts from the hollow foam sphere 3 in the liquid, the hollow foam sphere 3 is held up above a liquid surface and, at the same time, the heater 12 is disconnected. With this procedure, the liquid deuterium can permeate solely into a wall part of the hollow foam sphere 3.